Improved jet cleaning means



March 10 1942 s. GRoNw E1' Al.

IMPROVED JET CLEANING' MEANS Filed Jan. 18, 1940 Com des Patented ar.. i942 andere Royan ser cano.

Sigurd 'Gx-onow, lin Relsburg,

Enrich Ge "lr, L

.21 ANS assiors to Applicationznuary i8, 1940, Serial No. 314,436

lin

3 Claims. (Cl. l5@-n 129) 'y This invention relates to an improved .iet cleaning device for-apparatus used for heating and lighting purposes and which apparatus are fed with liquid fuel 4under pressure, especially air under pressure. It has been found that such apparatus suffer from the serious disadvantage of the jet getting choked by small particles of dirt or residue in the fuel. In 'order to remove such dirt and provide a free passage for the fuel such apparatus are usually providedwith mechanical cleaning devices of different constructions. A well-known cleaning device for such purpose comprises a rod arranged within a vaporiser, such rod having a needle at one end and a lever at the other for operating the said rod and consequently the needle. The lever which is operable externally, usually comprises a crank eccentically arranged on the inner end of a shaft. Such constructions although workable are found defective in that the operator who starts working the apparatus frequently forgets to clean the jet, which is an important step at the time of lighting the apparatus. Another mistake which usually and easily occurs is that the operator in order not to forget cleaning, cleans the jet too early, thatis, while the vaporiser is still cold, and before the vaporlser is preheated Vby the ame of the preheating'de vice or means. Under such conditions, the cleaning needle, which is very ne, can be readily bent as there are in the cold jet hard tar-like deposits and such deposits only becomesoft after the jet is heated up. The needle is likely to bend, as the correct operation of the device always requires one or more manipulations.

Another disadvantage of existing constructions is that if the needle remains too long a time in the jet, the flame extinguishes or blows back into the mixing tube.

In addition to the aforesaid drawbacks it -is nit always possible to avoid frequent leakage of fuel at the stung boxes of the needle operating levr. It is therefore the object of this invention to avoid all the aforesaid defects occurring y in the devices hertofore known.

In the lower part of the vaporiser tube there is provided a holehaving a pipe fitted thereat which leads intothe fuel container, the arrangement being such that when the piston israised by the compressed air pumped by the pump and the piston goes beyond the said hole, then the compressed air through the said hole and pipe connected thereto enters the fuel container, when however the piston of the pump goes back then the spring causes the piston with washer 5o rated to permit passage of air upper end the needle III.

to occupy the valve seat preventing thereby, the escape of fuel or air already pumped. In order however to avoid any likelihood of fuel or air' entering the pump the channel in the piece may 'be provided with anadditional ball Valve.

The invention will now be more fully described with reference to the accompanying drawing which illustrates the constructional features of our invention. In the drawing:

Fig. l shows the fuel container with the device according to this invention in section. l

Fig. 2 shows a modified form of the device.

Fig. 3, shows in plan the valve seat.

Fig. a shows a further embodiment of the in vention.

Referring to the drawing, I shows the oil container and 2 the pump built in the said container, the piston 3 being axially movable inside the pump cy der. The lower part e of the vaporiser is connected channel 5 which terminates at the valve seat part The valve seat part Ii is connected with the lower part of the vaporiser.

I shows a piston having a washer 8 at its lower end, said piston-being axially movable in the lower part Il of the vaporiser. 'I'he piston 'l cal'-l ries the needle rod 9, 'the latter having at its The washer 8 by the aid of spring I I acting on the piston I presses tightly on the valve seat 6a on the piece E. The spring II is held at its upper end by a tube I2 which has an extension I3 for limiting the upward movement of piston l. The lower part d of the vaporiser has a hole I4 from which a tube I5 extends downwards to the bottom of the container I. By means of the nut I6 part 4 is connected to the upper part Il of the vaporiser having the Jet I8.` It will thus be seen that according to this invention thepump 2, the valve seat 6a and lower part 6 of the vaporiser are all interconnected by a common piece which has at its inside a channel 5. The channel within'the piece may have a ball valve I9 as shown in Fig. 2.

Referring to Fig. 4., wherein is shown'a modincation of the invention, the lower end or the pump 2 containing the piston 3 is connected to the upper end of a member chined to receive at its upper ber A. This valve member A has a passage El extending axially therethrough and has associated with the lower end thereof a valve 2, usually consisting of corls. Surrounding the lower end of the valve A is a housing 23, perfothrough the sides with the pump 3 by a 2o, which is ma;- end a Valve mme I through the Ntube the tight closing of the valve.

thereof and within such housing is placed a spring 24, which urges the valve 22 into association with the lower end of the valve member A. The member 20 is provided` with a passage 25 connecting the valve member A with a chamber 26. Connected to or formed integral with the member 20 is the lower end of the vaporiser 4, having, as in the remaining figures, the needle rod 9 carrying the needle I0 at its top end and provided with a piston 1 at its lower end. As in Figs. 1 and 2, the lower end of the vaporiser 4 is provided with a hole I5 to which is connected the tube I5, 'extending to a point adjacent the lower end of the container I. Located within the vaporiser 4, and at the lower end thereof, is the spring II which urges the piston 1 downwardly into a position to open the passage through the tube I5 into the vaporiser. The lower end ofthe spring engages, as is usual with the upper end of the piston 1, While the upper end of such spring II is engaged by a tube I2 located within the vaporiser 4, and such tube I2 has an extension I3 thereon for limiting the upward movement of the piston 1.

The operation of the device shown in Fig. 4

is identical with that of the devices shown in Fig. 1. l

Referring to the operation of the device: when the piston 3 is operated, the compressed air,

flows .through the channel 5 to the valve seat part 6, lifts the piston 1 thereby providing passage for the air towards hole I4. lThus the compressed air escapes through the hole I4, then I5 into the fuel container I. When this happens the needle rod 9, as it is connected to the piston 1, is lifted up to the same amount as the piston 1 and the needle IQ therefore enters the jet I8. When however, the piston I of theA pump goes back, the spring II forces down the washer 8 of the piston on the valve seat 6a and prevents the air already entered the container to escape from the valve seat Ba. The needle rod 9 and piston 1 may be detachably secured to each other.

In the case of a vertically arranged vaporiser the action of the spring in keeping the piston 1 on the valve seat 6A is aided by the weight of the piston and the needle rod, while in any -other position the action of the spring II will be helped by the air pressure in the container. In this way several forces cooperate to secure If however by chance small quantities of fuel enter the valve seat 6a, or the channel 5 or even the pump cylinder, then the operation of the pump would not be affected. In order to prevent the fuel entering the pump the construction shown in Fig. 2 will be found useful in view of the provision lof ball valve I9. I

Generally speaking there is no difference in the function of the device, whether the means which transmit the pressure for the operation of the needle are liquid or gaseous.

It will be realised that in the device according to this invention everytime the apparatus is started the jet is cleaned thoroughly and automatically. Further during the operation of the apparatus when the pump is worked the jet will be also cleaned. Experience has however shown that every apparatus with a cleaning needle operated by hand directly or with a mechanical cleaning device is very seldom cleaned. Mostly it is cleaned onlywhen it is too-late, i. e., only when the carbon has so much accumulated in the` jet that the efficiency of the lantern is reduced. In the improved device according to this 5 invention neglect on the part of the operator is overcome as the operator must pump air from time 'to time thereby cleaning the jet automatically.

Further in the device according'. to this inven- 10 tion thel jet is cleaned so often during the functioning'of the apparatus that soot cannot ac- /cumulate in the jet. The needle also enters the jet softly vor it is operated 4by air pressure and it stays for a very short time in the jet. The

15 time required for cleaning the jet is very short and during the cleaning operation no perceptible eiiect is produced inthe case of lantern on the luminosity of the incandescent mantle due to a temporary stoppage of fuel supply. The short period for cleaning does not permit the flame to create soot or extinguish.

Another advantage of the device is'that due tothe absence of any stuffing box the leakage of fuel or air is prevented. A further very important advantage of the construction is that the pump and the lower part of the vaporiser are rigidly connected to each other. In this way if the container is deformed by the compressed air in its inside, this deformation hasy no influence on the position of the vaporiser.

It willof course be understood that this invention applies to heating apparatus e. g. stove as well as to lighting apparatus i. e., the lantern.

We claim:

1. In liquid fuel combustion apparatus, the combination of container means for containing liquid fuel, jet means, hollow passage means connecting said jet means with said container means for affording flow of the liquid fuel from said container means to said jet means, needle' means for cleaning said jet means disposed within said hollow passage means, said needle means having a pointed end disposed normally adjacent said jet means and further'including a rod member disposed reciprocably within said hollow passage means, piston means controlling I said rod member, air pump means extending into said container means for supplying air under pressure within said container means, fluid passage means connecting the discharge ofsaid air pump means within a zone proximate said piston means, and resilient means biasing said rod member and said piston means toward the discharge opening of said hollow passage means. whereby upon actuation of said air pump means for supplying air under pressure within said container means in conjunction with said resillent biasing means said rod member is reciprocated within said hollow passage means affording movement of said needle means within said jet means to clean the same.

2. In liquidfuel combustion apparatus, as in claim 1, vcharacterized by a tubular abutment for the resilient biasing means being disposed within o passage means and the piston means.

SIG-URD GROOW. 

